PSYCHOLOGICAL CONTRACT VIOLATION AND ORGANIZATIONAL CITIZENSHIP BEHAVIOR

A psychological contract is an implicit understanding between a group of employees and their employer that arose as a result of a particular leadership style. Psychological contract violation (PCV) is said to occur when there is a perceived breach of promise that leads to an emotional and affective response. The literature on PCV posits a number of antecedents and outcomes of PCV. This study seeks to develop a model of PCV by linking it with justice and organizational citizenship behavior (OCB). It is argued that the antecedents of PCV lead to a sense of  injustice. These will then create the emotional response that is indicative of PCV. It is also argued that an outcome of this PCV experience is reduced OCB and the emergence of a new outlook towards employment relationship. Data was collected from a Malaysian company that initiated a voluntary separation scheme as part of an effort to downsize its work force. The finding of this study provides partial support for the model

Manual for pre-clinical removable prosthodontics

DENTURE PROSTHODONTICS ‘Complete denture prosthodontics’ is defined as that body of knowledge and skills pertaining to the restoration of the edentulous arch with a removable dental prosthesis. While ‘complete denture prosthetics’ is defined as: 1. the replacement of the natural teeth in the arch and their associated parts by artificial substitutes 2. the art and science of the restoration of an edentulous mouth The complete denture treatment is the restoration of a completely edentulous (no teeth) by an artificial substitute called “Complete denture” which is the replacement of the upper (maxillary) and lower (mandibular) lost teeth by an appliance that may replace the lost teeth and their associated adjacent structure. The complete denture treatment is a treatment that deals with a pathological case, of having no teeth that renders the patient lacking the function of cutting the food as well as being psychologically disturbed of having the cosmetic corruption of the appearance of the face by losing the muscular support of the facial expression. The complete denture could be considered unique when compared to other prostheses replacements in the body, since it deals with both function and appearance, or in other words it deals with the physiology and psychology. Replacing missing teeth is a technical as well as a clinical procedure, a denture cannot be thought of like any other part of the body that can be worn or fitted according to size as no denture of one patient can fit another patient’s mouth even if they were twins. 7 The clinical part of the treatment is to obtain the informative anatomical landmarks from the patient oral cavity by the dentist, and transfer it to the laboratory where the technical part is taken over by the technician. The clinical and the technical aspects of the complete denture fabrication have got an ample intermingling relation that makes the dentist as well as the technician, scientifically and technically attentive of the work of the other. The complete procedure of making a denture should be made clear to the dental student prior to the clinic attendance, thus preparing the student to be fully aware of both the technical (preclinical) as well as the clinical aspects of the treatment and by mastering both it will be possible to understand the sequential steps and their consequences

Characterization of measured lightning electric fields observed in Malaysia

This paper presents a characteristic of lightning electric fields. The lightning electric fields captured by two parallel plats sensor and the characterization for preliminary breakdown pulse (PBP) and first return stroke (RS) were studied. A total of 207 data were recorded and 10 data are selected and been utilized in this paper accordingly. In PBP signal data, time before return stroke, ending time and maximum peak of PBP were analyzed. The time duration between the PBP and the occurrence of RS was obtained as 0.64 ms and 2.61 ms and then compared with results from other researchers. For RS signal data, slow front time, deviation time, RS peak, time to peak, zero crossing time and 10% to 90% rise time were evaluated meticulously and the results were discussed accordingly. Moreover, the statistical correlation between electric field zero times and corresponding rise times was studied

The electric field effect on angles of copper-type down-conductor

This paper is to study the effect of electric field on an angle variation of copper down-conductor due to voltage and current transient. Down-conductor which informs of numerous material, shape and dimension are mandatory for diverting the lightning current from air termination system to the grounding system in sheltered building. Hence, a numerical analysis method is applied emulating the comprehensible and particular model according to ordinarily used in the manufacturer’s datasheet specification. A rigorous assessment in term of electric fields was reviewed in comparison with the critical breakdown value of air for a crucial study. Later, a foremost angle is proposed for the installation of down-conductor in order to achieve a reliable protection system

On the behavior of lightning return stroke current incidence to tall towers

The return stroke current in the case of a lightning strike on a tall structure is affected by different tower and channel parameters such as the velocity of the return stroke current, the height of the observation point along the structure, the lightning channel and the reflection coefficients at the top and bottom of the structure. This paper will consider all these factors in the behaviour of the return stroke. The current wave shapes at different heights along tower and channel were modeled and the simulated current at tower top was compared to the corresponding measured current. Moreover, the effects of reflection factors and other important parameters on the values of current peak were considered and the results were discussed accordingly

Consideration of lightning current along a tall structure in the presence of horizontal arrangement grounding

The evaluation of the behaviour of lightning current along a tall structure is becoming an important issue when considering the lightning protection equipment required along a tall structure. This behaviour is affected by the element of the ground reflection factor which has a correlation between the impedance of the ground and the tower. The impedance of the ground is considered for a horizontal grounding arrangement while the impedance of the tower is assumed to be constant. Hence, the ground reflection factor can be given a variable value, whereas most of the existing literature assumes a constant value. When a constant value is entered into a calculation field, an inaccurate result is computed.In this paper, the lightning current along a tall structure under varying values of ground reflection factor and including the effect of the presence of a horizontal grounding arrangement has been considered and the results discussed accordingly. Modelling of the lightning return stroke current along a tall structure was undertaken by entering the calculated variable value of the ground reflection factor. The results indicated that a variable value of the ground reflection factor causes different peak values of the current and wave shape of the lightning current for different positions along a tall structure

Effect Of Lightning Impulse Current On The Grounding System Model

The main purpose of the grounding system is to protect human, electrical appliance and building from electrical shock due to lightning or another form of electricity that hazardous. Therefore, to achieve this goal, the fundamental part must be taken into account. In this paper, a different 3-D orientation of concrete has been designed using Comsol software to analyze the performance of the electric potential of the injected impulse in different cases and position of grounding system modelled. In this study, few grounding systems was modelled, which consist of Full concrete, Three-quarter concrete, Half concrete and A quarter concrete to analyse the electric potential of the injected lightning impulse current to the performance of the grounding system modelled. From the result obtained, full concrete was chosen as the best orientation of concrete to be employed at the grounding site. This is because, full concrete has the lowest electric potential value compared to the other cases and position of concrete

Modelling of lightning current in the case of striking to a tall structure

Lightning current is an important parameter that has to be considered. The different behaviour of lightning current depends on the way the lightning strikes either as a direct or indirect lightning strike. In this paper the modelling of the current as a result of a direct strike of lightning on a tall structure is considered. A few of up-to-date on current models, current functions, reflection factors, the return stroke velocity (RSV), the general equation representation of this case are reviewed. Also, through MATLAB software, the results of a case study are generated. The results show a good agreement with the measured values. In addition, the behaviour of the lightning current is evaluated at different heights of the lightning channel with respect to the top and bottom of a tall structure. Also, the lightning current at the top and bottom of the tall structure are observed for different values of the reflection factor. The results show that the peak of the lightning current along different heights of the channel with respect to the top and bottom of a tall structure decreases with increasing height of the channel. Also there is a time delay during the initial time period. Furthermore, the lightning current at the bottom of a tall structure has a high value of peak current and has an attenuation wave shape of current that compares with the lightning current at the top of the tall structure. As a result, this paper may provide benefit in evaluating the electromagnetic (EM) field since the behaviour of the lightning current on a tall structure is known

UNDER BUMP METALLURGY (UBM)-A TECHNOLOGY REVIEW FOR FLIP CHIP PACKAGING

ABSTRACT Flip chip packaging technology has been utilized more than 40 years ago and it still experiencing an explosives growth. This growth is driven by the need for high performance, high volume, better reliability, smaller size and lower cost of electronic consumer products. Wafer bumping is unavoidable process in flip chip packaging, thus, picking the correct bumping technology that is capable of bumping silicon wafer at high yield and a high reliability with lower cost is challenging. This paper discusses the available wafer bumping technologies for flip chip packaging. The discussion will be focused on process assembly, solder ball compatibility, design structure and lastly cost which translated to overall product costs